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Improved LCD FTIR

Nasir Aziz — Sat, 11 Apr 2009 07:00:43 +0000

Just improved upon my existing LCD FTIR setup. Fixed LEDs/resistors, replaced the camera from XBOX Live to PS3Eye with AlexP’s drivers. Demo here is from the same exact setup with the new improvements.

Also worth mentioning is that these results are through a NonCompliant surface – just bare Acrylic in a normal well lit room. Performance and response with PS3Eye camera and TBETA For PS3Eye is way better. Video might look a little choppy but in real life the results are super smooth. I’ll see if I can capture it without the chops again. In the meanwhile check it out.

LCD Screen: 17”
8 LEDs on each side(8×4 = 32 LEDs total) – evenly spaced
LED Wavelength: 880nm (SFH485: 5mm)
1 Ohm 1/4 W resistor per 8LEDs
12 VDC 1A Power to light up this array.
Acrylic: 5mm thick (Got it from Home Depot. Its thinner than what others have been using here)
PS3Eye Camera. Removed the IR Blocking Filter. Added an exposed photo negative 1 strip only as a filter.

Also had to grind the PS3Eye lens holder base a little for focus purposes. Once you remove the IR Blocking Filter from the lens, you’ll notice that the camera loses focus. You can either add a new similar thickness filter lens to get the focus back or if you want to go the cheap route like in my case, for that you’ll end up grinding the lens base a little (2mm roughly I guess) for focus.

My First LCD FTIR Project Completed

Nasir Aziz — Mon, 23 Jun 2008 11:25:28 +0000

So finally I was able to complete my first LCD FTIR Multi Touch Screen project. Once I gathered all the materials listed in the previous post, the housing of it all became an issue quickly. Meaning I didn’t want to initially set this up as a table top. I kind of wanted to have this on my desk so that I can play with it like a regular desktop computer setup.

Anyway, after some thought and an available resource, assembling and putting this whole setup together became clearer. I had an old Sony Trinitron 19″ CRT lying around at the house. Works but yeah who uses CRTs anymore? So I gut the whole thing out and left just the shell, meaning the body of this old and about to be recycled monitor.

Size and depth wise it turned out to be perfect for housing all of the LCD components. WebCam went all the way in the back. In front I attached Acrylic Sheet surrounded by IR LEDs in the inside followed by LCD, then LCD plexi type base, a diffuser that came with it plus original backlight tubes. The LCD power and other components were attached to the shell ceiling. Well it did take a little while to plan this out but was definitely faster than building the table for it.

After long hours of putting this together, it ended up looking like an actual regular monitor - except it ain’t.

Here is the video of it in action

Microsoft Surface Rio Vegas

Nasir Aziz — Mon, 09 Jun 2008 17:57:12 +0000

Here is a good example of MS Surface in a social setup: